Find the 15th term of the sequence: 12, 9, 6, ______?
- -30
- -31
- -32
- None of these
Explanation
Sequence: 12, 9, 6, ...
Decreasing by 3 each time
AP with a = 12, d = -3
Tn = a + (n-1)d
T15 = 12 + (15-1)(-3)
= 12 + 14(-3)
= 12 - 42
= -30
Last verified on 28-01-2026
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